We are looking for an experienced Mainframe Systems Engineer to join our client's team and ensure the stability, security, and performance of mission-critical environments. You will be responsible for managing and optimizing z/OS, CICS, IBM MQ, and IMS subsystems, while driving automation and compliance in a high-availability setting. Key responsibilities Install, configure, upgrade, and maintain z/OS, CICS, IBM MQ, and IMS software in line with enterprise standards and lifecycle best practices. Apply PTFs and Apars, manage patching and tuning to keep systems secure and up-to-date. Troubleshoot and resolve complex infrastructure issues, including dump analysis, performance tuning, and escalated incident support. Customize subsystem parameters and manage regions, started tasks, queue managers, and address spaces for CICS, MQ, and IMS. Automate operational tasks using JCL, REXX, and CLIST for monitoring, administration, and recovery. Collaborate with application, database, and network teams to ensure seamless integration of Middleware and core platform components. Implement robust security and compliance measures (e.g., RACF, SOX, PCI-DSS). Participate in disaster recovery drills and infrastructure tests to maintain business continuity. Maintain accurate documentation for system configurations, procedures, and change management activities. What we're looking for 5+ years of experience as a Mainframe Systems Programmer supporting z/OS, CICS, MQ, and IMS. Strong knowledge of SMP/E, system software upgrades, and subsystem customization. Expertise in Mainframe security administration (RACF or equivalent) and regulatory compliance. Proficiency in scripting and automation (JCL, REXX, CLIST) and familiarity with monitoring tools. Proven track record in high-availability environments and incident resolution. Nice to have: Experience with tools like Omegamon, Tivoli, or NetView. Knowledge of disaster recovery frameworks (e.g., Gdps). Exposure to financial services or other regulated industries. Hays plc est l'un des principaux groupes mondiaux de recrutement de professionnels. Hays est l'expert du recrutement de personnes qualifiées, professionnelles et compétentes dans le monde entier. Hays est le leader du marché au Royaume-Uni et en Asie-Pacifique et également l'un des leaders du marché en Europe continentale et en Amérique latine. Hays intervient pour le compte de milliers d'entreprises des secteurs privé et public, sur des postes en CDI, CDD, Travail Temporaire et Contracting. Hays France & Luxembourg compte aujourd'hui plus de 650 salariés répartis au sein de 22 bureaux (Aix-en-Provence, Amiens, Biarritz, Bordeaux, Clermont-Ferrand, Dijon, Grenoble, La Rochelle, Lille, Lyon, Montpellier, Nancy, Nantes, Nice, Paris, Reims, Rennes, Rouen, Strasbourg, Toulouse, Tours et au Luxembourg) couvrant 25 secteurs d'activité.